Dear Kobus
"The principal advantages of my three drum retort should be the 25% yield of char from the retort contents, coupled with the ability to use lower quality fuel as the starter fuel (outside the drum) and the self-stopping of the retort design (better safety, no need fro water), and the self-running aspect (light it and step back)." This is exactly what I observed to be the main advantage of the two-fuel system. Put your high value woods inside and the junk outside to get it started. Considering the advantage of the high gas speed, would stacking them two-high make energetic sense? I am thinking: Working for Water putting wattle slash and eradication inside and wattle leaves and twigs on the outside. The argument is that it would ensure a better kill of the seeds so they should collect the light trash as well. There is how many million ha to be cleared? Regards Crispin eJozi
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